/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*!
 * \file node_op_util.h
 * \brief abstraction for commonly used nnvm::Node operations.
 */
#ifndef MXNET_NNVM_NODE_OP_UTIL_H_
#define MXNET_NNVM_NODE_OP_UTIL_H_
#include <mxnet/base.h>
#include <string>
#include <unordered_map>
#include "../operator/elemwise_op_common.h"

namespace mxnet {
namespace util {

class NodeOpGen {
 private:
  const nnvm::ObjectPtr& dependent_node;

 public:
  explicit NodeOpGen(const nnvm::ObjectPtr& dependent_node) : dependent_node{dependent_node} {}

  nnvm::NodeEntry mul(const nnvm::NodeEntry& lhs, const nnvm::NodeEntry& rhs) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "elemwise_mul", dependent_node->attrs.name + "_mul", {lhs, rhs}, nullptr, &dependent_node)};
  }

  nnvm::NodeEntry mul(const nnvm::NodeEntry& x, double scalar) {
    const std::unordered_map<std::string, std::string> scalar_dict = {
        {"scalar", std::to_string(scalar)}};
    return nnvm::NodeEntry{mxnet::op::MakeNode("_mul_scalar",
                                               dependent_node->attrs.name + "_mul_scalar",
                                               {x},
                                               &scalar_dict,
                                               &dependent_node)};
  }

  nnvm::NodeEntry mul(double scalar, const nnvm::NodeEntry& x) {
    return NodeOpGen::mul(x, scalar);
  }

  nnvm::NodeEntry div(const nnvm::NodeEntry& lhs, const nnvm::NodeEntry& rhs) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "elemwise_div", dependent_node->attrs.name + "_div", {lhs, rhs}, nullptr, &dependent_node)};
  }

  nnvm::NodeEntry square(const nnvm::NodeEntry& x) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "square", dependent_node->attrs.name + "_square", {x}, nullptr, &dependent_node)};
  }

  nnvm::NodeEntry reciprocal(const nnvm::NodeEntry& x) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "reciprocal", dependent_node->attrs.name + "_reciprocal", {x}, nullptr, &dependent_node)};
  }

  nnvm::NodeEntry negative(const nnvm::NodeEntry& x) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "negative", dependent_node->attrs.name + "_negative", {x}, nullptr, &dependent_node)};
  }

  nnvm::NodeEntry ones_like(const nnvm::NodeEntry& x) {
    return nnvm::NodeEntry{mxnet::op::MakeNode(
        "ones_like", dependent_node->attrs.name + "_oneslike", {x}, nullptr, &dependent_node)};
  }
};

}  // namespace util
}  // namespace mxnet

#endif  // MXNET_NNVM_NODE_OP_UTIL_H_
